Power Lumbar Circuit Description w/o A45

Battery positive voltage (B+) is supplied at all times to the lumbar switch from the rear fuse block PWR SEAT Circuit Breaker.

When the lumbar switch is operated to move the lumbar back, battery positive voltage (B+) is applied via the lumbar backward switch contacts and the lumbar backward control circuit to the lumbar horizontal motor. The motor is grounded via the lumbar forward switch contacts and the forward control circuit to the motor. The motor runs to drive the lumbar back away from the occupant's back until the switch is released. Moving the lumbar forward works similarly to moving the lumbar back, except that battery positive voltage (B+) and ground are applied on the opposite circuits causing the motor to run in the opposite direction. This action drives the lumbar forward toward the occupant's back.

When the lumbar switch is operated to move the lumbar up, battery positive voltage (B+) is applied via the lumbar up switch contacts and the lumbar up control circuit to the lumbar vertical motor. The motor is grounded via the lumbar down switch contacts and the lumbar down control circuit to the motor. The motor runs to drive the lumbar up until the switch is released. Moving the lumbar down works similarly to moving the lumbar up, except that battery positive voltage (B+) and ground are applied on the opposite circuits causing the motor to run in the opposite direction.

Power Lumbar Circuit Description with AC9

Battery positive voltage (B+) is supplied at all times to driver and passenger adaptive lumbar modules from the rear fuse block MEM T&T Fuse. With the ignition in the ON position, battery positive voltage (B+) is also supplied to both adaptive lumbar modules via the ignition 3 circuit and the rear fuse block IGN 3 Fuse. With the ignition in the ON position, battery positive voltage (B+) is supplied to each lumbar switch via the power switch circuit and the appropriate adaptive lumbar module.

When the lumbar switch is operated to move the lumbar forward, battery positive voltage (B+) is applied via the lumbar forward switch contacts and the lumbar forward input circuit to the adaptive lumbar module. In response to this input, the adaptive lumbar module supplies a pulse width modulated signal via the adaptive pump control circuit and ground via the pump ground circuit to the lumbar pump motor. The lumbar pump motor runs to supply air to the lumbar bladder in the seat back. Adding air to the bladder increases the support. When the lumbar switch is operated to move the lumbar back, battery positive voltage (B+) is applied via the lumbar back switch contacts and the lumbar back input circuit to the adaptive lumbar module. In response to this input, the adaptive lumbar module releases air from the lumbar support bladder. Releasing air from the bladder decreases the support. The adaptive seat may be manually adjusted at anytime the ignition switch is in the ON position.

When the top of the lumbar switch is pressed to activate the adaptive function, battery positive voltage (B+) is applied via the AUTO/ON switch contacts and the auto input circuit to the adaptive lumbar module. In response to this input, the adaptive lumbar module will automatically adjust the lumbar support to the occupant by supplying a pulse width modulated signal via the adaptive pump control circuit and ground via pump ground circuit to the lumbar pump motor, to add air into the bladder or to release air from the bladder. When the lumbar switch is moved down in the OFF position, battery positive voltage (B+) is applied via the OFF switch contacts and the off input circuit of the adaptive lumbar module. In response to this input, the adaptive lumbar module will release all air from the bladders.

Power Lumbar Circuit Description with A45

Battery positive voltage (B+) is supplied at all times to the lumbar switch from the rear fuse block MEM T&T Fuse.

When the lumbar switch is operated to move the lumbar back, battery positive voltage (B+) is applied via the lumbar backward switch contacts and the lumbar backward circuit to the memory seat module (MSM). In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar backward control circuit and ground via the lumbar forward control circuit to the lumbar horizontal motor. The motor runs to drive the lumbar back, away from the driver's back until the switch is released. When the lumbar switch is operated to move the lumbar forward, battery positive voltage (B+) is applied via the lumbar forward switch contacts and the lumbar forward circuit to the MSM. In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar forward control circuit and ground via the lumbar backward control circuit to the lumbar horizontal motor. The motor runs to drive the lumbar forward toward the driver's back until the switch is released. The MSM also controls the lumbar horizontal motor during memory recall functions.

When the lumbar switch is operated to move the lumbar up, battery positive voltage (B+) is applied via the lumbar up switch contacts and the lumbar up circuit to the memory seat module (MSM). In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar up control circuit and ground via the lumbar down control circuit to the lumbar vertical motor. The motor runs in order to drive the lumbar up until the switch is released. When the lumbar switch is operated in order to move the lumbar down, battery positive voltage (B+) is applied via the lumbar down switch contacts and the lumbar down circuit to the MSM. In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar down control circuit and ground via the lumbar up control circuit to the lumbar vertical motor. The motor runs to drive the lumbar down until the switch is released. The MSM also controls the lumbar vertical motor during memory recall functions.

The memory seat module (MSM) supplies a 5 volt reference voltage via the 5 volt reference circuit and ground via the sensor ground circuit to the respective lumbar position sensors. The MSM receives a feedback voltage signal from the sensors via the lumbar vertical and horizontal sensor signal circuits.

Power Lumbar Circuit Description with AM3

Battery positive voltage (B+) is supplied at all times to the driver and passenger front seat lumbar switches and massage modules from the rear fuse block PWR Seat Circuit Breaker.

When the lumbar switch is operated to move the lumbar back, battery positive voltage (B+) is applied via the lumbar backward switch contacts and the lumbar backward circuit to the memory seat module (MSM). In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar backward control circuit and ground via the lumbar forward control circuit to the lumbar horizontal motor. The motor runs to drive the lumbar back away from the occupant's back until the switch is released. When the lumbar switch is operated to move the lumbar forward, battery positive voltage (B+) is applied via the lumbar forward switch contacts and the lumbar forward circuit to the MSM. In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar forward control circuit and ground via the lumbar backward control circuit to the lumbar horizontal motor. The motor runs to drive the lumbar forward toward the occupant's back until the switch is released. The MSM also controls the lumbar horizontal motor during memory recall functions.

To help understand the manual up/down function of the lumbar massage circuit description, an explanation follows. The voltage signal from the lumbar switch goes from the switch to the massage module, from the massage module to the memory seat module (MSM), back to the massage module, then from the massage module to the lumbar vertical motor. When the lumbar massage is operating, the MSM is by-passed and is not part of the lumbar massage control circuit.

When the lumbar switch is operated to move the lumbar up, battery positive voltage (B+) is applied via the lumbar up switch contacts and the lumbar up circuit to the massage module. In response to this input, the massage module applies battery positive voltage (B+) via the lumbar up input circuit to the memory seat module (MSM). In response to this input, the MSM applies battery positive voltage (B+) via the lumbar up input circuit back to the massage module. The massage module in turn supplies battery positive voltage (B+) via the lumbar up control circuit and ground via the lumbar down control circuit to the lumbar vertical motor. The motor runs in order to drive the lumbar up until the switch is released. When the lumbar switch is operated in order to move the lumbar down, battery positive voltage (B+) is applied via the lumbar down switch contacts and the lumbar down circuit to the massage module. In response to this input, the massage module applies battery positive voltage (B+) via the lumbar down input circuit to the MSM. In response to this input, the MSM applies battery positive voltage (B+) via the lumbar down input circuit back to the massage module. The massage module in turn supplies battery positive voltage (B+) via the lumbar down control circuit and ground via the lumbar up control circuit to the lumbar vertical motor. The motor runs to drive the lumbar down until the switch is released. The MSM also controls the lumbar vertical motor during memory recall functions.

When the lumbar switch is momentarily activated up to initiate the massage function, battery positive voltage (B+) is momentarily applied via the lumbar up circuit to the massage module. In response to this input, the massage module will then cycle battery positive voltage (B+) and ground via the lumbar up and down control circuits to the lumbar vertical motor. The motor will then move the lumbar support up and down for 10 minutes or until the lumbar switch is operated to cancel operation.

The memory seat module (MSM) supplies a 5 volt reference to the lumbar horizontal and vertical position sensors and the massage module via the 5 volt reference circuit. The MSM also supplies a reference ground via the sensor ground circuit to both lumbar sensors and the massage module. The MSM receives a feedback voltage direct from the lumbar horizontal sensor via the lumbar horizontal sensor signal circuit. During non-massage operation, the MSM receives a feedback voltage from the lumbar vertical sensor via the lumbar vertical sensor signal circuit to the massage module, then from the massage module via the lumbar vertical sensor output circuit to the MSM. During massage operation the MSM has no control of this function. For memory recall purposes, when massage operation has ceased, the massage module will then update the MSM with the new vertical position of the lumbar.